ACCORDING TO THE PASSAGE, WHICH OF THE FOLLOWING ARE POLLUTANT...

Câu 29.

According to the passage, which of the following are pollutants in the Denali area?

A.

arsenic

B.

human waste

C.

gold

D.

pesticides

Mark the letter A,B,C or D on your answer sheet to indicate the word or phrase that is CLOSEST

in meaning to the underlined part in each of the following questions.